
UNC5221 BRICKSTORM: China APT, 393-Day Dwell in Law Firms
UNC5221 BRICKSTORM backdoor averages 393 days undetected in US legal firms and SaaS providers. Full TTP profile and VMware vCenter detection guide inside.
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2 results tagged UNC5221

UNC5221 BRICKSTORM backdoor averages 393 days undetected in US legal firms and SaaS providers. Full TTP profile and VMware vCenter detection guide inside.

CVE-2023-46805 is an authentication bypass (CVSS 8.2) in Ivanti Connect Secure and Policy Secure. Chained with CVE-2024-21887, a command injection (CVSS 9.1), it produces unauthenticated remote code execution on the VPN gateway. Exploited as a zero-day by suspected Chinese state-sponsored actor UNC5221 for at least two weeks before disclosure. CISA issued Emergency Directive 24-01 ordering federal agencies to disconnect or mitigate within 48 hours. Over 2,100 devices were compromised globally before patches were available.